Jeb Bush calls Donald Trump a 'loser'

Jeb Bush called Donald Trump's a "loser" on Wednesday for his second-place finish in the Iowa caucuses, while praising Ted Cruz's work ethic.

"[Cruz] outworked everybody, and he won. It doesn’t necessarily translate beyond that, but to his credit, he won," Bush said during an interview on Hugh Hewitt's radio show. "And the other interesting thing is Donald Trump lost. He’s a loser."

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Bush said Trump's losing to Cruz in Iowa will show voters that the real estate mogul and former reality TV host can be defeated.

"Well, it proves that he wasn’t invincible, for starters, and secondly, the whole case that he makes is 'I’m great because I’m winning. I’m great, because the polls show me winning'," Bush said, adding, "It matters that he lost in that regard and now is trying to excuse it away."

The attack is an interesting gambit for Bush, who finished sixth in the caucuses with 2.8 percent of the vote compared to Trump's second place finish with 24.3 percent of the vote. Bush also trailed Rand Paul, who withdrew from the race today after his fifth-place showing.